BASE CAMP 1/4 - SURVIVORS' CAMP
Coordinates: [712474; 3415979]
Note: Can't be missed, discovered automatically upon arriving at the survivors' beach (the end of The Fast Way Down).
BASE CAMP 2/4 - THE FLOODED VAULT
Coordinates: [712529; 3415963]
Note: Inside The Flooded Vault optional tomb.
BASE CAMP 3/4 - THE GROTTO
Coordinates: [712523; 3415953]
Note: Can't be missed, discovered automatically on your way from the Endurance back to the survivors' beach (the end of Gone Missing). It's located on a high ledge, in the spot occupied by three guards.
BASE CAMP 4/4 - TEMPLE OF THE HANDMAIDENS
Coordinates: [712494; 3415994]
Note: Inside the Temple of the Handmaidens tomb, the second optional tomb (the one closer to the survivors).